The circuit is designed to develop a time delay based switch to control any load. A 555 timer is used in monostable mode to drive an LED in place of relay to switch ON/OFF a load for fixed time duration.

A time delay based LED stays on for a certain period of time once activated. This circuit is made up of a simple adjustable timer circuit which controls the actual relay. The time is adjustable from 0 to few seconds but can be increased by increasing the time constant of the mono-stable 555-timer. The project is offered with an LED as a load and not a relay.

This circuit finds applications in washrooms where one need to switch on and off the lights.

Further this Circuit can be enhanced by integrating a Solid-state Relay in order to drive a 230V AC mains operated Light.

Note:This DIY kit doesn't include soldering iron, multimeter, cutter and screwdriver as it is not required.

One solderless multipurpose breadboard and set of basic components will be provided for each of the 5-in-1 Solderless project kit. This 5-in-1 Solderless Project kit will be provided with additional 4 free circuits which can be built by additionally procuring very few components. Thus, students can explore and develop total 5 projects at the cost of 1 project kit only.

All the engineering, diploma and other technical students from first year to final year can get hands on experience in designing and developing various electronics projects with these 5-in-1 solder less project kits. Completely assembled project is available in image format besides real time working in audio visuals to help students to complete one DIY kit with ease and then try engineering skills to attempt the other free circuits provided as no additional components are required. With this solderless breadboard approach none of the component is soldered, hence all the components can be used again and again to try such multiple circuits.